Grinder for the production of wood-pulp.



A. CURTIS. GRINDER FOR THE PRODUCTION OF WOOD :PULP.

APPLICATION FILED MAY17,19I3. 1,164,074. Patented Dec.14,1915.

2 SHEETSSHEET I.

WITNESSES ATTORNEYS 1A. CURTIS. GRINDER FOR THE- PRODUCTION OF WOOD PULP.

APPLICATION FILED MAY 7 913. i 1,164,074. Patented Dec. 14, 1915.

WITNESSES INVE/VTOR v ATTORNEYS Paiar union.

ALLEN CURTIS, or GLENS FALLS, ivnw YORK, ASSIGNOR To INTERNATIONAL PAPER COMPANY, on NEW YORK, N. Y.,

A CORPORATION or unwvonn.

GRINDER FOR THE rROnUc'rIoN or WOon-rULP.-

Wood-Pulp; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which itappertains to make and use the same.

My invention relates to'certain new and useful improvements in grinders for the pro-" ductionof wood pulp; that is to say, in

grinders of that type wherein the wood forced into contact with the periphery of a grind-stone by means of power pistons operstone by having the pressure shoe of the'pis ton rod exert its pressure froma point substantially midway ofthe length of the pocket, :1 single piston beingiused for each of the several pockets of the grinder;

According to the present invention, thereare substituted for the single piston heretofore employed, two pistons, located at oppo-,

site sides of the longitudinalcenter of the pocket, and each having a' separate pressure shoe. By this arrangement, it is feasible to employ grind-stones of greater width to advantage in the grinding of the wood, and nevertheless to attain the necessary pressure of contact required for speedy operation.

Consequently, the wood to'be ground neednot be cut up into the shorter lengths now. customary, and-a corresponding economy is effected because of the lesser amount of sawduct wasted incutting the-wood up into lengths. So also, the circumstance that the pistons and their pressure shoes are multiplied for each pocket and are independent of each other permits them individually to adjust themselves to the wood and thereby to produce a more uniform or equalized contact between the woodiand the periphery of the grind-stone than is customary in grinders of the ordinaryconstruction.

In the accompanying drawings, Figure 1 represents a longitudinal section of a wood Specification of Letters Patent. Application filed May 1'2,

Patented Dec. 14%., 1915. 1913. Seria1No.768,198

grinder constructed in accordance with my invention; Fig. 2 represents a cross-sectional View thereof on the line 22 of Fig. 1.,

Similar letters of reference indicate simi-' lar parts in both views- Referring to the drawings, A indicates the frame or housing in which is mounted 1 the rotatory power shaft B of the grindrstone C, said shaft being journaled in suitable bearings, as shown. Upon the housin A are bolted the several pockets D of the grinder, which pockets may, as is usual, be three in number. The'pockets are open at one end for the reception of the wood, and

are provided with doors or gates a forclosmg the open ends when desired:

Each pocket is provided with a cap or lid E, preferably cast in a single piece. At op-' posite ends of this lid are the pressure cylinders F, each containing a pistonG and de- -pendingpipe b, which latter makes a slidlng tight joint withfa stuffing box '0 in the" end of its cylinder. As indicated in Fig. 2,

the several pistons are adapted'to be moved outwardlyand inwardly by whatever motive fluid is employed (preferably 'water under pressure)v admitted and exhausted the art.

Each pocket is provided with guides d for the pressure shoes H, fluted on their lower surfaces and carrying friction rollers e.

The shoes H are connected by a rod I, which passes through the tube 6, with the piston G, this connection being effected by means of a connecting headf having 'suflicient freedomof motion to permit small variationsin the through the ports and passages-showm'in a manner well understood by those skilled in angular position of the shoe H to accommo- I date the latter moreadv'antageously to the more or less irregular contour of the wood to be ground.

The admission of the water or other pressure fluid to the rear of the pistons forces I the shoes H against the wood andexerts the necessary pressure of the wood against the periphery of the grind stone essential for the grinding operation, water being supplied to the grind-stone to the amount required, asis customary in the making of wood pulp. The individual shoes of the pistons accommodate themselves separately to the surfaces of the wood, and have the effect of forcing it against the grind-stone.

from two centersof pressure at opposite sides of the longitudinal center of the wood, instead of from one center of applicationv as heretofore. As a cons'equence, the wood is found .to hug the surface of the grind stone more closely and more uniformly, and the grinding action of the stone is exercised to correspondingly increased advantage in the operation of the machine. So also, if

it is found that a greater pressure is re-. 'quired at any particular interval of time, in

the one cylinder than in the other, the means are at hand for obtaining that result, by reason of the independent control of each provided in the arrangement shown.

The feature of employing the pipe I), in

stead of the rod I as the sliding element of the stuflingbox for the several-pressure cylinders', permits the cylinders to be efiectuallypacked against leakage, and takes all lateral strains off thesaid sliding element,

the rod I being connected directly to the headof the piston, so as to receive the full effect of thepush thereof, while, at the same time, the said rod is adapted to move laterally to the limited extent contemplated, without coming in contact with the walls of the pipe'b. The full effect of the piston is,

therefore, exerted through the shoe," upon the wood, with the avoidance of any possi-.

bility of-interfering with the free movement of'the-pipe b in the stuffing box and with the avoidance of the wear that would be due to side strains.

I believe it to be wholly n'ewin the art, to so construct the pressure mechanism for forcing the sticks of wood-againstthe periph'ery of the grindstone that the sticks are followed up and forced against the stone at each end without regard to the pressure or advance at the opposite end; and it will be manifest to the skilled mechanic that the details of construction here- -in shown may be modified, provided this mode of action is retained.

Having thus described my invention, what I claim is -1. A'grinder forthe production of wood pulp, comprising a cylindrical grindstone, means for holdingthe 'wood to be ground against the periphery of the stone in the,

- direction of its axis,'and means constructed and arranged to urge each end of the wood forwardagainst the stone independently of the opposite end.

2. A grinder for'the' production ofwood pulp," comprising a cylindrical rotatory grind-stone and stationary pockets for holding the wood to be ground across the periphery of the stone, in combination with pressure shoes located at opposite sides of the center of the pockets, and means for j 7. A grinder for theproduction of wood 'woodheld in said pocket, and a plurality of pressure devices operable in- -said pocket in- "forcing said pressure shoes independently against the wood.

3. A grinder for the production of wood pulp, comprising a rotatory grind-stone and a pocket for holding the'woo d to be ground across the periphery of the stone, and independently-acting pressure devices located. atopposite ends of the pocket, to act onop- 'posite ends'of the wood.

4;. A grinder for the production of wood pulp, comprising a rotatory grind-stone and pockets to sustain the wood to be ground across the periphery of the stone, in combination with pressure shoes' located at opposite sides of the center of the pockets; power pistons and connections between the pressure shoes and power pistons having a limited freedom of movement so that the pressure shoes may act individuallyto force the wood against the stone.

5. A grinder for the production of wood pulp, comprising a rotatory cylindrical grind-stone and pockets to holdthe' wood pocket carrying two pressure cylinders located respectively at opposite ends thereof,

.each of said cylinders having-its piston connected to a corresponding pressure shoe within'the pocket.

6. A grinder for the production of wood pulp, comprising means for holding the sticks of wood to be ground, a grinding device adapted to operate. on said sticks,.'and

a plurality of pressure devicesioperable to act independently of each other at different pointsin the length of the individual sticks to forcethe same againstthe grinding device. Y

pulp, comprising a frame provided with a pocket to hold the'wood to be ground, a

grinding-device adapted-to operate on the' dependently of each other simultaneously on different portions of'the wood, to force the same'against the grinding device.

8. A grinder for the production of wood series of pockets to receive the sticks of woodtobe ground, a rotary grind-stone adapted to operate on the sticks in said pockets, and two pressure devices in each of 115 said pockets operable independently of each other respectively on opposite ends of the sticks.

In testimony whereof I afiix my signature, l in presence of two witnesses.

, v ALLEN CURTIS.

Witnesses:

CLINTON CASSIDY, F. E. HOLLAND.

pulp, comprising a frame provided with a 

